Island in the Bay of Naples (6)
I believe the answer is:
ischia
'island in the bay of naples' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ischia that I've seen before include "Home of islander" , "Parts of pelvis; isle near Naples" , "Volcanic island in the Bay of Naples" , "Volcanic island near Naples" , "Island at the north end of the Bay of Naples" .)